《前端面试题》- CSS - 利用flex设置水平垂直居中
核心代码
display: flex;
align-items: center;
justify-content: center;
实例：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div style="background-color: red; width: 300px; height: 300px;display: flex; align-items: center; justify-content: center;">
<div style="background-color: blue; width: 100px; height: 100px;"></div>
</div>
</body>
</html>
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